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From "Arin Sarkissian (JIRA)" <j...@apache.org>
Subject [jira] Issue Comment Edited: (CASSANDRA-299) make table directory creation lazy
Date Fri, 14 Aug 2009 21:11:14 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-299?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12743446#action_12743446
] 

Arin Sarkissian edited comment on CASSANDRA-299 at 8/14/09 2:09 PM:
--------------------------------------------------------------------

but instances_ is only used in Table.open() and the constructor's private... should be pretty
safe IMO.

Table.open() is the only public interface to the constructor or _instances... aka its the
only public way to get a Table

      was (Author: phatduckk):
    but instances_ is only used in Table.open() and the constructor's private... should be
pretty safe IMO.

Table.open() is the only public interface to the constructor or _instances...
  
> make table directory creation lazy
> ----------------------------------
>
>                 Key: CASSANDRA-299
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-299
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Jonathan Ellis
>            Priority: Minor
>             Fix For: 0.5
>
>         Attachments: 0001-lazy-creation-of-Table-dirs.-only-open-tables-that-h.patch
>
>
> checking that each subdir for each table is present on startup -- _every_ startup --
could be a real pita.
> i think that to support 100k tables (not impossible, in a hosted-cassandra-as-a-service
scenario) we're going to want to make table dir creation lazy.
> then we would want to make scanning for sstables faster by only doing one listdir call
per datadir, to see which table subdirs are present, and then checking only those for sstable
files.  this would involve some re-org of the onstart code.
> (note that we don't want to prune directories if there are no sstables left in them,
since we'd end up re-creating them at some point anyway; we just want to allow the lack of
a table subdir to imply the same thing as an empty one.)

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